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Patents > Inventor country : BE or DE & IPCs : IPC B64B1/40 or IPC B64C23/00

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LTA (19) · airplane (12) · frame (12) · stability (11) · propeller (9) · balloon (8) · hybrid (8) · propulsion (7) · design (6) · navigation (6) · propellers (6) · Airship (6) · takeoff (6) · construction (5) · whole (4) · gyroscope (4) · Suspension (3) · control (3) · nacelle (3)
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